Electric-arc lamp



Patented Sept. 20, I898.

M. HARRIS.

ELECTRIC ARC LAMP.

(Application filed Oct. 27, 1897;)

(No Model.)

uonms PETERS cnwumouma, WASHINGTON o c FFICE.

MAX HARRIS, OF NEW YORK, N. Y., ASSIGNOR TO THE MANHATTAN GENERAL CONSTRUCTION COMPANY, OF NEW YORK.

ELECTRIC-ARC LAM SPECIFICATION forming part of Letters Patent No. 610,898, dated September 20, 1898.

A lication filed October 27, 1897 Serial No. 656,533. (No model.)

To all whom it may concern:

Be it known that I, MAX HARRIS, a citizen of the United States, residingat New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Arc Lamps, of which the following is a full, clear, and exact description.

This invention relates to electric-arc lamps of the type known as the inclosed arc.

The object of the invention is to provide means whereby the operation of trimming the lamp will be greatly facilitated, the lamp shortened, and its appearance improved.

The invention will be described with reference to the accompanying drawings, in which- Figure 1 is a side elevation of the lamp, showing the parts in operative position; and Fig. 2, a similar View showing the parts in position for trimming.

The arc-regulating mechanism is contained in the casing A, as shown. To the bottom of this casing is secured in any suitable manner, either air-tight or not, as desired, an

outer globe B. The bottom of this globe is provided with an opening coveredby a dropping lid or pan b, hinged at the point b and held in place by a snap-catch 19 This lid is preferably made of glass and'curved to form a continuation of the sides of the globe.

Projecting downward from the base-plate of the casing A into the outer globe are two hollow side rods 0 0, connected together at their lower ends by a yoke c in the form of a ring. d is the inner or arc-inclosing globe, provided with the usual cap or gas-check d and supported upon a lower-carbon holder d This carbon-holder is normally embraced by the ring 0. It forms the middle portion of a yoke d the extremities of which are attached to the lower ends of the two rods 61 d These rods telescope upward through the side rods 0 and serve as guides for the movement of the inner globe and the parts supporting it. The upper extremities of the rods d are provided with knobs d or other enlargements which rest upon flanges formed at the lower ends of the rods 0. Latch-hooks e or other suitable means are provided for sustaining the inner globe and the parts supporting it in the elevated position.

To trim the lamp, the lid b is unlatched and dropped. Then the latches e are lifted, and the inner globe, the yoke 01 and the rods 61 are lowered to the position shown in Fig. 2 and there left suspended while the carbons are changed and the trimming completed. After trimming the parts are again raised to the position shown in Fig. 1 and thelid I) closed. I

The methods heretofore proposed for trimming these lamps have consisted either in dropping or removing the outer globe to give access to the inner globe or else in bodily removing the inner globe from the remainder of the lamp and trimming it while it is held in the hand. The former plan is clumsy and often results in the breaking of the globe either by the trimmer or by the wind, while the latter plan cannot always be carried out on account of the heat in the frame of the lamp, the current from which may have been recently turned off. In dispensing with the stem which usually projects downward from the lower-carbon holder the lamp is shortened and its shadow lessened, and the uninterrupted spherical shape of the bottom of the outer globe improves the appearance of the lamp.

Having thus described my invention, I claim- 1. In an arc-lamp, the combination of a fixed outer globe provided with an opening in its bottom, a cover, removably attached to said opening, a movable inner or arc-inclosing globe and a support for the same wholly inclosed within the outer globe, means for lowering the inner globe with its support through the opening in the outerglobe, and means for sustaining it in its lowered position, substantially as described.

2. In an arc-lamp the combination of a fixed outer globe provided with an opening in its bottom, of two hollow side rods extending into the globe, an inner or aro-inclosing globe, a yoke or bracket supporting the same, a pair of rods attached to said yoke or bracket and telescoping the said hollow rods and means for lowering the inner globe and the parts supporting it through the opening in the bottom of the outer globe and for sustaining it in its lowered position, substantially as described.

In testimony whereof I subscribe my signature in presence of two Witnesses.

MAX HARRIS. Witnesses:

WM. A. ROSENBAUM, HARRY BAILEY. 

